An Instance of the Service is Already Running

We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

More Information

If a client attempts to connect to a COM server after the COM server starts, but before the COM server registers its factory, the COM will attempt to start the service. For a service like the World Wide Web Publishing Service (W3SVC) in Internet Information Service version 4.0, the second attempt to connect to the COM server will fail; however, the CoCreateInstance should succeed.


After you install the Windows NT Option Pack, you may receive the following error messages in the event log:

System Error, Source=DCOM, Event ID=10005
The event details contains the description:
DCOM got error "An instance of the service is already running. "
attempting to start the service IISADMIN with arguments "" in order
to run the server:
Application Error, Source=Ci, Category=CI Service, Event ID=4147
The event details contains the description:
The IISADMIN service is not available, so virtual roots cannot be indexed.


These error messages are generated because another application, such as Microsoft Transaction Server, has already started the DCOM (the Distributed Component Object Model) Service. These messages do not indicate an actual problem and are benign.


To resolve this problem, obtain the latest service pack for Windows NT version 4.0. For more information, please see the following article in the Microsoft Knowledge Base.

152734 : How to Obtain the Latest Windows NT 4.0 Service Pack


Id. de artículo: 184620 - Última revisión: 07/30/2008 - Revisión: 1